From Bulbapedia, the community-driven Pokémon encyclopedia.

A Pokémon Hunter is a person that sells Pokémon for profit. It does not seem to matter where the Pokémon are from, trainers or the wild. J is a Pokémon Hunter. These villains are usually defeated by Ash and co., sometimes with some help from Jessie, James, and Meowth.

Known Examples

• Captain Crook
• J
• Pokémon Poacher Brothers (Braggo, Blurt, Chico)
• Rico